Fecha de publicación: -- Fuente: WIPO "biotechnology" The invention relates to the biotechnological industry, particularly to methods for purifying the waste waters being formed in process of molasses reprocessing. The method provides for anaerobic-aerobic purification with microorganisms. The anaerobic purification is performed with granulated microorganisms, the aerobic purification being performed with microorganisms immobilized on fibrous carrier. Use of this invention allows to increase specific load on the equipment of purifying units, simplify apparatus and technological scheme of purification, considerably reduce the total term of waste waters stay in purifying units, reduce electric power inputs.